Chasing tennis balls at the U.S. Open has always struck us as a particularly grueling ordeal. For 24-year-old
Kelly Bruno, »8/29/08 12:20pm 8/29/08 12:20pm whose right leg was amputated when she was six months old, all that leaping and diving and ball-scooping is nothing. Bruno's a major track star who's competed in Ironman competitions and…